Derrick-frame construction



Oct. 8, 1929. w. H.. CATER DERRICK FRAME CONSTRUCTION Filed Jan. 28, 1929 Patented Oct 8, 1929 WILLIAM H. CATER, OF CHICAGO, ILLINOIS DERRICK-FRAME CONSTRUCTION Application filed January 28, 1829. Serial No. 335,526.

My invention pertains to certain features of novelty and advantage in demountable frame structures, such as reinforced derrick constructions, its leading aim or prime purpose being the provision of such an arrangement of parts that the apparatus while strong and rigid may nevertheless be easily taken apart for transportation to some new location where it can be readily erected with speed and dispatch.

More specifically, the novel structural fea tures concern more particularly the manner of reinforcing the columns or posts at the corners of the structure and the joints between their sections, as well as the method or mode of attaching the cross members of theconstruction.

To enable those skilled in this art to fully understand the invention and to appreciate its many benefits, in the accompanying drawing forming a part of this specification, 1 have illustrated a present, desirable, preferred embodiment of the invention and for simplicity, like parts throughout the several views of the drawing have been supplied with the same reference characters.

121 this drawing: I

Figure 1 isa fragmentary elevation of a reinforced derrick construction incorporating the features of the invention;

Figure 2 is longitudinal section through the a corner post shown in Figure 1;

Figure 3 is an enlarged cross-section on line 33 of Figure 1; and 1 Figure 4 is a similar cross-section on line 4-4 of Figure 1..

Referring to the views of this drawing, it-

will be noted that each slightly-inclined corner-post 11 of the structure comprises a sectional main or outer angle-bar 12 and a similar, inner, oppositely-facing angle-bar 13, with its edges bearing on the companion outer member 12, as is clearlypresented. in Figaure 3.

As is shown, the lengthwise-aligne sections of the pair of bars have their joints offset, so that any joint 10 of the outer bar is opposite the center of a section of the inner bar, and, conversely, each oint 20 of the inner, reinforcing bar is in register with the center of the correlated outer bar section.

At each joint ofthe outer bar, as depicted in Figure 3, a right-angle bracket or strap 14 overlaps the abutting ends of, and is bolted, welded or riveted at 15, 15, to, the adjacent sections 12, 12, such element 14 bein of adequate dimensions to extend beyond t e longitudinal edges of the two angle-bars 12, 12 which it fastens together.

Bymeans of bolts. 16, 16, such protruding bracket ends are detachably secured to the end portions of horizontal angle-bars or girts 17, 17 tying the corner-post under consideration with its two neighbors, the ends of such elements bearing on the adjacent surfaces of the contiguous or adjoining, reinforcing or strengthening bar 13, thus maintainin the latter in proper position to perform-its unction to good advantage.

The inclined, crossing, also be fastened by bolts bracket.

In dissociating or dissevering the frame structure, the mere removal of the bolts 16 and 19 frees the reinforcing, inner angle-bar 13 at this point.

If desired, all three, or the bars 17, be used for in place.

At each joint 20 between the post sections 13, 13, as shown in Figure 4, the outer bar 12 has an angle-bracket 21 fastened to it by bolts or rivet-s 22, and to the ends of this are fastened similar ends of a bent plate 23 extending around and overlapping the ends of the two elements 13, 13 with terminal ears 24, 24- inside of and bearing against the end portions of the bracket or bent plate 21.

In this instance, bolts 25 and 26 secure the ends of the horizontal and diagonal bars, 17 and 18 respectively, to both members 21 and 23, in much the same manner as described above, except for the interposition of the ends 24 of the inner bracket 23, the latter serving to securely hold the abutting ends of the post sections 13, 13 in register and in reinforcing relation to the correlated post section 12. i

From the foregoing it will be apparent that the elements entering into the frame structure tie bars 18, 18 may 19, 19 to the same any one or more, of 18, 18 at each side of the post may holding the inner inclined bar 13 are simple in design and are held together by means which allow the frame to be takenapart with facility, one especial feature of the device being the retention of the reinforcing bar in place by the transverse tie bars which are easily put in position and readily detached.

The invention is not necessarily limited and restricted to all of the details of structure shown and described and many minor me chanical changes may be incorporated in the construction without departure from the heart and essence of the invention as defined by the appended claims and without the loss of any material advantages inherent in-the invention. I claim: 1. In a reinforced derrick construction, the combination of. a post composed of a plurality of outer bar sections arrangedend-toend and a plurality of inner bar sections arranged end-to-end and with their joints offset with respect to those of said outer bar sections, brackets secured to said outer bar sections at their joints, tie bars detachably secured to said brackets and bearing at their ends against the corresponding inner bar sections to hold the latter in place.

2. In a reinforced derrick construction, the combination of a post composed of a plurality of outer bar sections arranged end-to-end and a plurality of inner bar sections arranged endto-end with their edges bearing on said outer sections and with their joints ofiset with respect to those of said outer bar sections, brackets secured to said outer bar sections at their joints, tie bars detachably secured to said brackets and bearing at their ends against the corresponding inner bar sections to hold the latter in place. 3. In a reinforced derrick construction, the combination of a post composed of a plurality ot outer bar sections arranged end-to-end, a pluralit of reinforcing inner bar sections arranged end-to-end and with their joints offset with respect to those of said' outer bar sections, brackets secured to said outer bar sections at and overlapping their joints, and tie bars detachably secured to said brackets, the ends of saidtie bars holding said inner so bars in place at said outer bar joints.

4. In a reinforced derrick construction, the combination of a post composed of a plurality I ofouter bar sections arranged end-to-end, a plurality of reinforcing inner bar sections l6 arranged end-to-end and with their joints ofiset with respect to those of said outer bar sections, straps encircling both said inner and outer bar sections 'at the joints of the former, \and'means detachably fastening the ends of '00 transverse tiebars to said straps.

In witness whereof 'I have hereunto set my hand.

WILLIAM H. GATER- 

